:root {
    --bg: #fff;
    --fg: #000;
    --muted: #6b6b6b;
    --border: #ccc;
    --soft: #f7f7f7;
    --accent-grad: linear-gradient(90deg, #6e59ff 0%, #ff4d4d 45%, #ff7cc8 100%);
}
:root.dark {
    --bg: #000;
    --fg: #fff;
    --muted: #b9b9b9;
    --border: #333;
    --soft: #0f0f0f;
    --accent-grad: linear-gradient(90deg, #b7a6ff 0%, #ff7a7a 45%, #ff9ad8 100%);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    background: var(--bg);
    color: var(--fg);
    font-family: 'Helvetica Neue', sans-serif;
    line-height: 1.6;
}


.screen {
    min-height: 100svh;
    display: grid;
    place-items: center;
    padding: 2rem;
}

.card {
    background: linear-gradient(var(--soft), var(--soft)) padding-box,
    var(--accent-grad) border-box;
    border: 1px solid transparent;
    border-radius: 16px;
    padding: clamp(1.5rem, 3vw, 2.25rem);
    max-width: 720px;
    width: 100%;
    text-align: center;
    box-shadow: 0 6px 24px rgba(0,0,0,0.06);
}

h1 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin-bottom: 1rem;
}

.intro {
    font-size: 1.1rem;
    margin-bottom: 1.2rem;
}

p {
    margin: 0 0 1rem;
    font-size: 1rem;
    color: var(--fg);
}

a {
    color: inherit;
    text-decoration: underline;
    text-decoration-color: var(--border);
    transition: color 0.2s ease;
}

.cta-row {
    display: flex;
    gap: .6rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 1rem;
}

.btn {
    display: inline-block;
    padding: .8rem 1.2rem;
    border-radius: 8px;
    font-weight: 700;
    text-decoration: none;
    color: var(--fg);
    background: var(--soft);
    border: 1px solid var(--border);
    transition: transform .18s ease, border-color .18s ease, background .18s ease;
    min-width: 10rem;
    text-align: center;
}
.btn:hover {
    transform: translateY(-2px);
    background: linear-gradient(var(--bg), var(--bg)) padding-box,
    var(--accent-grad) border-box;
    border: 1px solid transparent;
}

footer {
    text-align:center;
    border-top:1px solid var(--border);
    padding:1.5rem;
    font-size:.9rem;
    color:var(--muted);
}

.dark-toggle {
    position:fixed;
    top:14px;
    right:14px;
    width:46px;
    height:28px;
    border-radius:999px;
    border:1px solid var(--border);
    background:var(--bg);
    cursor:pointer;
    padding:0;
    z-index:10;
}
.dark-toggle .knob {
    display:block;
    width:22px;
    height:22px;
    margin:2px;
    border-radius:50%;
    background:var(--fg);
    transition:transform .25s ease;
}
:root.dark .dark-toggle .knob {
    transform:translateX(18px);
}